package com.itheima.controller;

import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/*
* 文件的上传与下载
* */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String bassPath;
    /*
    * 文件上传
    * */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info(file.toString());
        //原始文件名
        String originalFilename = file.getOriginalFilename();
      String suffer=  originalFilename.substring(originalFilename.lastIndexOf("."));
 //使用UUID重新生成文件名，防止文件名称重复覆盖源文件
        String FileName = UUID.randomUUID().toString()+suffer;
        //创建一个目录
        File dir=new File(bassPath);
        //判断当前目录是否存在
        if (!dir.exists()){
            //目录不存在,创建一个目录
            dir.mkdir();
        }
        try {
            file.transferTo(new File(bassPath+originalFilename));
        } catch (IOException e) {
            e.printStackTrace();
        }

        return R.success(FileName);
    }

    /*
    *文件下载
    * */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

        try {
            //输入流读取文件
            FileInputStream fileInputStream = new FileInputStream(new File(bassPath+name));
            //输出流
            ServletOutputStream outputStream = response.getOutputStream();
         response.setContentType("image/jpeg");

            int length=0;
            byte[] bytes=new byte[1024];
          while ((length=fileInputStream.read(bytes))!=-1){
              outputStream.write(bytes,0,length);
              outputStream.flush();
          }
          outputStream.close();
          fileInputStream.close();
        }catch (Exception e){
            e.printStackTrace();
        }




    }
}
